Public bug reported:
USB backend never ends if the printer is not connected. we have been
able to identify a infinity loop in print_device function in usb-
libusb.c file:
```
fprintf(stderr, "DEBUG: Printing on printer with URI: %s\n", uri);
while ((g.printer = find_device(print_cb, uri)) == NULL)
{
_cupsLangPrintFilter(stderr, "INFO",
_("Waiting for printer to become available."));
sleep(5);
}
```
It's also easy to test by invoking the backend by hand:
```
# export DEVICE_URI='usb://Printer/Model?serial=?'
# /usr/lib/cups/backend/usb 0 root title 1 '' data.file
DEBUG: Loading USB quirks from "/usr/share/cups/usb".
DEBUG: Loaded 159 quirks.
DEBUG: Printing on printer with URI: usb://Brother/PJ-773?serial=?
DEBUG: libusb_get_device_list=6
INFO: Waiting for printer to become available.
DEBUG: libusb_get_device_list=6
INFO: Waiting for printer to become available.
DEBUG: libusb_get_device_list=6
INFO: Waiting for printer to become available.
DEBUG: libusb_get_device_list=6
INFO: Waiting for printer to become available.
DEBUG: libusb_get_device_list=6
INFO: Waiting for printer to become available.
...
```
Setting a job timeout policy or stopping the job by hand are not options
for us. We can have job that take up to an hour to complete.
** Affects: cups (Ubuntu)
Importance: Undecided
Status: New
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https://bugs.launchpad.net/bugs/1890572
Title:
USB backend never ends if the printer is not connected
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